Numerical investigation on the performance of the helical and conical coil heat exchanger configuration in the dynamic mode of heat extraction

Khurana, Hitesh and Majumdar, Rudrodip and Saha, Sandip K (2021) Numerical investigation on the performance of the helical and conical coil heat exchanger configuration in the dynamic mode of heat extraction. In: 2nd International Conference on Recent Advances in Fluid and Thermal Sciences (ICRAFT), March 19-21, 2021, BITS Pilani Dubai Campus, Virtual Conference.

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Abstract: . Owing to the high heat transfer performance, compact design and large surface area per unit volume, the curved and helical circular tubes have many applications such as heating, refrigeration, air conditioning, steam generation, heat extraction etc. One of the ways to improve the performance of water heating systems is to enhance the performance of immersed heat exchanger. In solar heating systems, immersed heat exchangers of curved shape are used to charge and discharge sensible heat water storage tanks. Effect of arrangement and position of the tubes, geometry of coil, configuration, shape, flow rate, type of working fluid, Reynolds number associated with flow, and inlet temperature to coil, on the performance of storage systems have been studied in the literature. Rate of discharge, heat transfer coefficient, effectiveness of heat exchanger, heat transfer rate, discharging efficiency and increment in temperature of outlet fluid are the standard performance parameters to evaluate the heat transfer and fluid flow phenomenon in the curved tubes. Heat transfer characteristics are investigated and analyzed for one helical and two conical coil (conical and inverted conical) configurations using a three-dimensional unsteady numerical model. The numerical model is validated against reported experimental result and a good agreement is found. For the same length of the coil, the inverted conical configuration presents more heat transfer surface area to the incoming hot fluid entering the thermal energy storage tank, as compared to conical coil and helical coil configurations, leading to higher extraction of thermal energy. Based on the performance parameters, inverted conical coil experiences enhanced heat transfer, high overall heat transfer coefficient and better effectiveness of heat exchanger as compared to helical and conical coil configurations.
Item Type: Conference or Workshop Item (Paper)
Subjects: Programmes > Energy Environment and Climate Change Programme
School of Natural and Engineering Sciences > Energy and Environment
Date Deposited: 12 Sep 2022 16:32
Last Modified: 20 Sep 2022 11:57
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